Ex 3
Bob and his family are in the living room. His father, Ronald,1) is sitting (sit) in front of the tv. He 2)..........(is watching) a funny programme and he 3)......(is smiling). Bob 4)..........(is sitting) at his desk. He 5)........(is doing) his homework. His mother, Debbie, 6)...........(is talking) on the phone. His sister, Julie7)......(is not drawing) a picture. She 8).......(is playing) with her doll.
Ex 4
1) Yes, he is.
2) No, he isn't .
3) No, they aren't.
4) No, he isn't.
5) No, she isn't.
6) Yes, she is.